On the localization,the fine structure,and the chemical composition of crystalline inclusions in theThesium humifusum haustoria |
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Authors: | S Renaudin Noelle Cheguillaume |
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Institution: | (1) Present address: Groupe de Zoo et Phytopathologie, Laboratoire de Cytologie structurale appliquée à la Phytopathologie, U.E.R. des Sciences de la Nature, Nantes, France |
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Abstract: | Summary TheThesium humifusum haustoria onMedicago marina roots, fixed in October–November, frequently contain in the cytoplasm of their cells inclusions consisting of sticks 0,3 m in thickness and 8 to 10 m in lenght, alone or associated in stacks of 3 or 6 units. These sticks consist of fibres , 10 nm in thickness, oriented in the same direction and separated from the others by a gap of 8 nm; these fibres seem to be composed of helically wound filaments and a less electron-dense matrix.The chemical composition of these inclusions was studied by enzymatic digestion in ultra thin sections; pronase digested the cytoplasmic paracrystals. This demonstrates that they are composed primarily of protein.The physiological significance of the inclusions is discussed: presumably the haustorium functions as a storage organe. |
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